I never liked the Wheelskins, they look too aftermarket for my taste, I'm the type I'd rather have either the OEM plastic or OEM leather, call me cynical if you want, everyone else does. As far as the airbag light, far as I know all new cars come with airbags so it's not a question of if it detects one or not but maybe it's detecting the "wrong one." Because of accident investigations and stuff, maybe airbags are programmed specifically for each vehicle. If an airbag doesn't deploy in a head-on collision and it was tampered with, it makes it harder for the owner/driver to sue in court since they screwed with the airbag, is my guess.
Unless the dude just didn't plug it back it correctly, or, there could also be an extra pin or two on the connector specific to that trim?? So in other words, if you were to replace a sport trim airbag with another sport trim airbag, it won't malfunction, but if you cross trim levels, it will. I dunno, I think a Wheelskins would be a really good idea right about now.